Corrugator



L. J. LIST CORRUGATOR April 17, 1934.

Filed March 23, 1933 MW ATTO R N EY5 Patented Apr. 17, 1934 UNITED STATES E'ATENT @FFECE CORRUGATOR of New Jersey Application March 23, 1933, Serial No. 662,228

6 Claims.

In corrugating machines of the type shown in the Sieg Patent 1,335,816, and theLangston Patents 1,186,997, 1,186,998, and 1,642,782, there are provided a pair of intermeshing corrugating rollers between which a sheet of paper is passed to be corrugated a mechanism for applying adhesive to the crowns of the corrugations of the corrugated sheet while the latter is juxtaposed to one of said rollers, and a smooth-surfaced roller for pressing a surface sheet against the adhesive coated crowns of the corrugations of the corrugated sheet while the latter is in contact withthe last mentioned or second corrugating roller.

To prevent the corrugated sheet from sagging away from the periphery of the second corrugating roller, it is customary to provide guide members positioned close to the periphery of the second corrugating roller,'as shownin the Sieg Patent 1,835,816. r p

The adhesive applying mechanism shown in the patents referred to includes a pair of rollers for taking up adhesive from a pan or other receptacle, delivering the adhesive to the crowns of the corrugations of the corrugated sheet, and reg ulating the thickness of the layer of adhesive so delivered. Theadhesive applying roller juxtaposed to the second corrugating roller is provided with a series of circumferential grooves through which, or into which, these guide members extend, at or adjacent to the line of tangency of these two rollers. I a

In operation and particularly at high speed, adhesive enters the circumferential grooves of the adhesive applying roller and centrifugal force causes this adhesive to be projected from said grooves to form beads on the surface of said roller adjacent to opposite edges of each of the grooves. Thus the adhesive will be evenly distributed on the surface of the transfer roller, and will be unevenly and inefficiently applied to the crowns of the corrugated sheet.

One object of the present invention is to remedy this condition, and to prevent uneven distribution of adhesive over the surface of the applying roller, so that a uniform layer of adhesive will be applied to the crowns of the corrugated sheet.

Another object is the preventing of the silicate getting on the corrugating rolls; The width of the paper run on the machine may be from 24" up to the full width of the machine, which may be 74" or wider. The beads of silicate that build up on the applying roller will accumulate where be shut down and cleaned up, taking one-half to one hours time.

I accomplish this result by providing a series of inserts or fillers which extend into the circumferential grooves of the adhesive applying roller, and prevent adhesive from entering said grooves, and thereby prevent uneven distribution of adhesive on the surface of the applying rollerat the sides of said grooves, and prevent said beads from building up.

In the accompanying drawing, there are shown for the purpose of illustration, certain embodiments of the present invention. In the drawing:

Fig. 1 is a vertical longitudinal section through a portion of a corrugating machine having one embodiment of the present invention.

Fig. 2 is a section taken on the line 2-2 of Fig. 1.

Fig. 3 is a top plan view showing a scraper which may be used with the filler shown in Fig. 1, and

Fig. 4 is a vertical section similar to a portion of Fig. 1, but showing details of another form of filler.

The present invention is illustrated as forming a part of a machine designed for the manufacture of corrugated paper, and of the general type shown in the patents above referred to. In this machine a sheet 10 to be corrugated is caused to pass between a pair of intermeshing corrugating rollers 11 and 12, each having the periphery thereof provided with longitudinally extending grooves and teeth or ridges.

After the sheet '10 has been corrugated between the two rollers 11 and 12, adhesive is applied to the crowns of the corrugations of the sheet by means of a transfer roller 13 which is disposed adjacent to but spaced from a pick-up roller 14, the lower portion of which is immersed in apan 15 containing silicate of soda or other suitable adhesive. The transfer roller is rotated at approximately the same surface speed as the corrugating roller 12, and the pick-up roller 14 is rotated to carry adhesive from the pan 15 to the surface of the transfer roller.

A. liner or surface sheet 16 is pressed against the adhesive coated crowns of the corrugated sheet by means of a smooth-surfaced pressure roller 18. The resultant single-faced corrugated paper 1? passes out from the rollers 12 and 18.

Means are provided for stripping the sheet from engagement with said roller 11 as said sheet passes beyond the intermeshing portions of the corrugating rollers, and for guiding the corru gated sheet and prevent it from sagging to only fingers 2c.

a slight distance from the middle or second corrugating roller 12 during the travel of said sheet from the corrugating roller 11 to the pressure roller 18. This means comprises a series of transversely curved guide members in the form of fingers adjacent to the periphery of the second corrugating roller 12 between the rollers 11 and 18, and extending approximately the full distance. They may be supported in any suitable manner, as for instance on brackets 24 connected to a bar 25. The end portions 21 may extend to or beyond the line of tangency of the pitch circles of the corrugating rollers 11 and 12 to insure the proper stripping action. In order to receive the ends of these guide fingers in this position, the corrugating roller 11 may be provided with a series of circumferential grooves 22, and the transfer roller 13 must be similarly provided with circumferential grooves 23 to receive the intermediate portions of said guide The construction so far described may be similar to those shown in one or more of the aforesaid patents, or may be of any suitable form adapted for the purpose.

As an important feature of the present invention, means are provided for preventing any substantial amount of adhesive from being transferred from the surface of the pick-up roller into the circumferential grooves 23 of the transfer roller. For that purpose, th re is provided a series of inserts or fillers which, in the constructions shown in Figs. 1 to 3 inclusive, take the form of a plurality of rings 26 encircling the pick-up roller 14 and spaced longitudinally therealong. *hey may be connected to the pick-up roller by any suitable means. For instance, they may have a friction fit with the peripheral surface of the pick-up roller 14, and may be made of any suitable material, such as Bakelite. These rings 26 extend into the circumferential grooves 23 of the transfer roller, and each has a width butv slightly less than the width of the corresponding 'groove,.and a radial dimension slightly less than the depth of the groove, so as to permit free rotation of the rings with respect to said grooves while substantially filling the grooves at the line of tangency, and preventing any. substantial amount of adhesive from being transferred into the grooves from the surfaceof the pick-up roller 14. By means of this construction, the adhesive will be applied to only the outer surface of the transfer roller 13 between the grooves.

Unless the rings be rigidly fixed to the pick-up roller, it is desirable to provide means for preventing their axial displacement along the roller 14. For that purpose, there is provided a guide member 27 connected to the frame structure of the machine by any'suitable means, and having a series of slots 28 adapted to receive the rings 26. This member 27 serves not only to prevent the axial movement or skewing of the rings 26, but also serves to prevent any gradual building up by the setting of silicate on the pick-up roller 14 and the rings 26 from the pan 15. For that purpose, the guide member 27 is on that side of the pickup roller 14 moving downwardly, so that the excess adhesive is scraped 011 the sides and periphcry of the rings 26 and surface of the roller 14 beforethey pick up a new supply of silicate. This guide member 27 advantageously slants downwardly as shown in Fig. 1, so that any adhesive thereon will flow back into the pan 15.

r In Fig. 4 is shown another form of inserts or fillers for preventing the flow of adhesive from the surface of the pick-up roller 14 into the cir-..

cumferential grooves 23. In this form, the fillers comprise a series of spaced fixed fingers 30 transversely curved and disposed in the grooves 23 between the pick-up roller 14 and the transfer roller. These fingers 30 are supported at one end in any suitable manner, and are but slightly thinher than the widths of the grooves 23 to permit free rotation of the transfer roller 13 with respect to said fingers, while blocking the flow of adhesive in said grooves. One end of each finger may constitute a scraper 31 to remove adhesive from the portion of the surface of the pick-up roller which will come into registry with the groove in the transfer roller.

In the forms illustrated, one roller serves as a pick-up roller and the other as a transfer roller, and the spacing of the two controls the thickness of the layer of adhesive carried by the transfer roller to the paper. Obviously, the pick-up roller may also serve directly as the applying roller and the other roller may serve solely to regulate the thickness of the layer of adhesive, and without either delivering to the paper or picking up adhesive from the pan.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A machine for making corrugated paper, including a corrugated roller, guide members for holding a corrugated sheet adjacent to the periphery of said corrugated roller, a peripherally grooved adhesive applying roller adjacent to said corrugated roller for applying adhesive to the crowns of said sheet, said guide members passing between said rollers in the grooves of said applying roller, a further roller adjacent to said applying roller for regulating the thickness of the layer of adhesive on the surface of said applying roller, and means also projecting into the grooves of the applying roller at the line of tangency with the second mentioned roller for preventing adhesive from passing between said rollers in said grooves, and for preventing any substantial amount of adhesive from being delivered from said grooves to the paper.

2. A machine for making corrugated paper, including a corrugated roller, guide members for holding a corrugated sheet close to the periphery of said roller, a peripherally grooved roller adjacent to said corrugated roller for applying adhesive to the crowns of the corrugated sheet, said guide members passing between said rollers in the grooves of said applying roller, a roller adjacent to said applying roller for regulating the thickness of the layer of adhesive on the surface of said applying roller, and members extending into the portions of the grooves at the line of tangency with said last mentioned roller, said members substantially filling said grooves to prevent the transfer of anysubstantial amount of adhesive from said last mentioned roller into said grooves, while permitting said applying roller to rotate with respect to said latter members.

3. In a machine for making corrugated paper, the combination with the usual corrugating rollers, a peripherally grooved adhesive applying roller, guide members extending in the grooves of said applying roller for holding the corrugated sheet close to the periphery of one of said corrugating rollers, and another roller for regulating the thickness of the layer of adhesive on the surface of said applying roller, of a plurality of rings carried by and spaced longitudinally along said other roller, and extending into said grooves to prevent any substantial amount of adhesive from being carried to the paper in said grooves.

4. A machine for making corrugated paper, and having means for preventing the delivery of adhesive from the grooves of the adhesive applying roller to the paper, said means comprising a layer controlling roller having a plurality of rings encircling the same, spaced apart longitudinally thereof, connected thereto for rotation therewith, and extending into the grooves of said applying roller, said rings being but slightly smaller than the widths of the grooves, and a member extending longitudinally of said layer controlling roller and having a series of slots engaging said rings to prevent axial displacement thereof along said layer controlling roller, and for removing any excess adhesive taken up by the rings before said rings rotate into engagement with said grooves.

5. A machine for making corrugated paper, including a corrugating roller, a guide member for holding the corrugated paper close to the periphery of said roller, an adhesive applying roller having a peripheral groove, said guide member passing between said rollers in said groove, a further roller, and a finger extending into said groove at the line of tangency with the further roller, and substantially filling the groove at the line of tangency.

6. A machine for making corrugated paper, including a corrugating roller, a peripherally grooved adhesive applying roller, a roller for regulating the thickness of the layer of adhesive on the surface of said applying roller, and a plurality of fixed circumferentially curved fingers spaced longitudinally with respect to said regulating roller, and extending respectively into the portions of the grooves of the applying roller at the line of tangency with the regulating roller to prevent the building up of beads of adhesive on the surface of the applying roller at opposite edges of said grooves, and thereby to prevent any substantial amount of adhesive from being transferred to the paper from said grooves.

LEONARDO J LIST. 

